So... is TO finished or not?
NO, it is not finished.
Why?
The anime finished after the manga:
Anime finished: October 02, 2009
Manga finished: May 06, 1986
... But MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
The mangas and the non-core contents are excluded by default, but you can enable them by clicking the buttons below:
Synopsis
TO is a science fiction anime presented in two separate stories.
The first, "Elliptical Orbit," follows the urgent mission of a space freighter returning to Earth with a vital energy source. When terrorists attack the moon base where the freighter is scheduled to dock, the survival of humanity hangs in the balance.
The second, "Symbiotic Planet," centers on a forbidden romance between two individuals from warring nations on a colonized planet. As they navigate political tensions and strange new lifeforms, a dangerous threat emerges that tests their love and forces them to rely on each other and the planet's unique inhabitants for survival.